document.addEventListener("touchstart", function (event) {
  if (event.touches.length > 1) {
	event.preventDefault();
  }
});
let lastTouchEnd = 0;
document.addEventListener(
  "touchend",
  function (event) {
	let now = new Date().getTime();
	if (now - lastTouchEnd <= 300) {
	  event.preventDefault();
	}
	lastTouchEnd = now;
  },
  false
);
document.addEventListener("gesturestart", function (event) {
  event.preventDefault();
});
// 禁止双指手势缩放
// document.documentElement.addEventListener('touchstart', function (event) {
//     if (event.touches.length > 1) {
//         event.preventDefault();
//     }
// }, {
//     passive: false
// });